Calculate composite scores by weighting different categories. Perfect for grading rubrics, performance reviews, test sections, and multi-criteria evaluations with live charts.
Enter category scores and weight percentages to get a composite score with letter grade.
A weighted score combines multiple category scores into a single composite by multiplying each score by its assigned weight percentage. This ensures more important categories have greater impact on the final result.
Equal weighting assumes all categories matter equally. Weighted scoring lets you assign 40% to a final exam and 10% to homework, reflecting true importance. The composite score changes dramatically based on weight distribution.
Type each data point into the 'Value' column. These are the scores you want to weight.
Enter the weight % for each value. The calculator accepts any positive numbers as weights.
The calculator computes your result instantly. See the weighted result, sum of products, sum of weights, and interactive charts update in real time.
The weighted score formula: multiply each value by its weight, sum those products, then divide by the total of all weights.
Enter each value alongside its weight. For example: Written 92 (weight 50), Practical 78 (weight 30), Oral 85 (weight 20).
92 × 50 = 4600, 78 × 30 = 2340, 85 × 20 = 1700.
4600 + 2340 + 1700 = 8640.
50 + 30 + 20 = 100.
8640 ÷ 100 = 86.40.
When values have unequal importance, simple averaging misleads. This calculator weights correctly.
Always divide by the sum of weights, not the number of values.
Putting values in the weight column produces wrong results. The labeled columns prevent this.
Multiply each value by its weight. Sum products. Sum weights. Divide. The calculator automates this.
Use the weighted score calculator to compute weighted results. Edit values below.
The weighted result accounts for different weights across categories, giving a more accurate composite than a simple average.
Another real-world example. Edit values to see the result update instantly.
The weighted result reflects the true composite value when different sources have different levels of importance or volume.
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Weights must be positive. The calculator requires positive weights. A weight of zero excludes that value entirely.
Equal weights = simple average. If every value has the same weight, the weighted result equals the simple average.
Result always falls between min and max values. No matter the weight distribution, the result will always be between the smallest and largest values.
Larger weights dominate the result. The larger a weight relative to the total, the more the result is pulled toward that value.
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